5792a2856a
A device can be removed from an md array via e.g.
echo remove > /sys/block/md3/md/dev-sde/state
This will try to remove the 'dev-sde' subtree which will deadlock
since
commit e7b0d26a86
With this patch we run the kobject_del via schedule_work so as to
avoid the deadlock.
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
371 lines
11 KiB
C
371 lines
11 KiB
C
/*
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md_k.h : kernel internal structure of the Linux MD driver
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Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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You should have received a copy of the GNU General Public License
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(for example /usr/src/linux/COPYING); if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _MD_K_H
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#define _MD_K_H
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/* and dm-bio-list.h is not under include/linux because.... ??? */
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#include "../../../drivers/md/dm-bio-list.h"
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#ifdef CONFIG_BLOCK
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#define LEVEL_MULTIPATH (-4)
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#define LEVEL_LINEAR (-1)
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#define LEVEL_FAULTY (-5)
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/* we need a value for 'no level specified' and 0
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* means 'raid0', so we need something else. This is
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* for internal use only
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*/
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#define LEVEL_NONE (-1000000)
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#define MaxSector (~(sector_t)0)
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typedef struct mddev_s mddev_t;
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typedef struct mdk_rdev_s mdk_rdev_t;
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/*
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* options passed in raidrun:
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*/
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/* Currently this must fit in an 'int' */
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#define MAX_CHUNK_SIZE (1<<30)
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/*
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* MD's 'extended' device
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*/
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struct mdk_rdev_s
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{
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struct list_head same_set; /* RAID devices within the same set */
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sector_t size; /* Device size (in blocks) */
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mddev_t *mddev; /* RAID array if running */
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unsigned long last_events; /* IO event timestamp */
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struct block_device *bdev; /* block device handle */
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struct page *sb_page;
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int sb_loaded;
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__u64 sb_events;
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sector_t data_offset; /* start of data in array */
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sector_t sb_offset;
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int sb_size; /* bytes in the superblock */
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int preferred_minor; /* autorun support */
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struct kobject kobj;
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/* A device can be in one of three states based on two flags:
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* Not working: faulty==1 in_sync==0
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* Fully working: faulty==0 in_sync==1
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* Working, but not
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* in sync with array
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* faulty==0 in_sync==0
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*
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* It can never have faulty==1, in_sync==1
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* This reduces the burden of testing multiple flags in many cases
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*/
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unsigned long flags;
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#define Faulty 1 /* device is known to have a fault */
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#define In_sync 2 /* device is in_sync with rest of array */
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#define WriteMostly 4 /* Avoid reading if at all possible */
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#define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */
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int desc_nr; /* descriptor index in the superblock */
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int raid_disk; /* role of device in array */
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int saved_raid_disk; /* role that device used to have in the
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* array and could again if we did a partial
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* resync from the bitmap
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*/
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sector_t recovery_offset;/* If this device has been partially
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* recovered, this is where we were
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* up to.
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*/
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atomic_t nr_pending; /* number of pending requests.
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* only maintained for arrays that
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* support hot removal
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*/
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atomic_t read_errors; /* number of consecutive read errors that
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* we have tried to ignore.
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*/
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atomic_t corrected_errors; /* number of corrected read errors,
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* for reporting to userspace and storing
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* in superblock.
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*/
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struct work_struct del_work; /* used for delayed sysfs removal */
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};
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struct mddev_s
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{
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void *private;
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struct mdk_personality *pers;
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dev_t unit;
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int md_minor;
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struct list_head disks;
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unsigned long flags;
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#define MD_CHANGE_DEVS 0 /* Some device status has changed */
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#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
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#define MD_CHANGE_PENDING 2 /* superblock update in progress */
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int ro;
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struct gendisk *gendisk;
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struct kobject kobj;
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/* Superblock information */
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int major_version,
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minor_version,
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patch_version;
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int persistent;
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int chunk_size;
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time_t ctime, utime;
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int level, layout;
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char clevel[16];
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int raid_disks;
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int max_disks;
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sector_t size; /* used size of component devices */
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sector_t array_size; /* exported array size */
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__u64 events;
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char uuid[16];
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/* If the array is being reshaped, we need to record the
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* new shape and an indication of where we are up to.
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* This is written to the superblock.
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* If reshape_position is MaxSector, then no reshape is happening (yet).
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*/
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sector_t reshape_position;
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int delta_disks, new_level, new_layout, new_chunk;
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struct mdk_thread_s *thread; /* management thread */
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struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */
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sector_t curr_resync; /* last block scheduled */
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unsigned long resync_mark; /* a recent timestamp */
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sector_t resync_mark_cnt;/* blocks written at resync_mark */
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sector_t curr_mark_cnt; /* blocks scheduled now */
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sector_t resync_max_sectors; /* may be set by personality */
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sector_t resync_mismatches; /* count of sectors where
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* parity/replica mismatch found
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*/
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/* allow user-space to request suspension of IO to regions of the array */
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sector_t suspend_lo;
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sector_t suspend_hi;
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/* if zero, use the system-wide default */
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int sync_speed_min;
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int sync_speed_max;
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int ok_start_degraded;
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/* recovery/resync flags
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* NEEDED: we might need to start a resync/recover
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* RUNNING: a thread is running, or about to be started
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* SYNC: actually doing a resync, not a recovery
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* ERR: and IO error was detected - abort the resync/recovery
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* INTR: someone requested a (clean) early abort.
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* DONE: thread is done and is waiting to be reaped
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* REQUEST: user-space has requested a sync (used with SYNC)
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* CHECK: user-space request for for check-only, no repair
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* RESHAPE: A reshape is happening
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*
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* If neither SYNC or RESHAPE are set, then it is a recovery.
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*/
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#define MD_RECOVERY_RUNNING 0
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#define MD_RECOVERY_SYNC 1
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#define MD_RECOVERY_ERR 2
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#define MD_RECOVERY_INTR 3
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#define MD_RECOVERY_DONE 4
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#define MD_RECOVERY_NEEDED 5
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#define MD_RECOVERY_REQUESTED 6
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#define MD_RECOVERY_CHECK 7
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#define MD_RECOVERY_RESHAPE 8
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#define MD_RECOVERY_FROZEN 9
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unsigned long recovery;
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int in_sync; /* know to not need resync */
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struct mutex reconfig_mutex;
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atomic_t active;
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int changed; /* true if we might need to reread partition info */
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int degraded; /* whether md should consider
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* adding a spare
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*/
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int barriers_work; /* initialised to true, cleared as soon
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* as a barrier request to slave
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* fails. Only supported
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*/
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struct bio *biolist; /* bios that need to be retried
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* because BIO_RW_BARRIER is not supported
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*/
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atomic_t recovery_active; /* blocks scheduled, but not written */
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wait_queue_head_t recovery_wait;
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sector_t recovery_cp;
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spinlock_t write_lock;
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wait_queue_head_t sb_wait; /* for waiting on superblock updates */
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atomic_t pending_writes; /* number of active superblock writes */
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unsigned int safemode; /* if set, update "clean" superblock
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* when no writes pending.
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*/
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unsigned int safemode_delay;
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struct timer_list safemode_timer;
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atomic_t writes_pending;
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request_queue_t *queue; /* for plugging ... */
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atomic_t write_behind; /* outstanding async IO */
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unsigned int max_write_behind; /* 0 = sync */
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struct bitmap *bitmap; /* the bitmap for the device */
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struct file *bitmap_file; /* the bitmap file */
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long bitmap_offset; /* offset from superblock of
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* start of bitmap. May be
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* negative, but not '0'
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*/
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long default_bitmap_offset; /* this is the offset to use when
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* hot-adding a bitmap. It should
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* eventually be settable by sysfs.
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*/
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struct list_head all_mddevs;
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};
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static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev)
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{
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int faulty = test_bit(Faulty, &rdev->flags);
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if (atomic_dec_and_test(&rdev->nr_pending) && faulty)
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set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
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}
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static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors)
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{
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atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io);
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}
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struct mdk_personality
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{
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char *name;
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int level;
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struct list_head list;
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struct module *owner;
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int (*make_request)(request_queue_t *q, struct bio *bio);
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int (*run)(mddev_t *mddev);
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int (*stop)(mddev_t *mddev);
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void (*status)(struct seq_file *seq, mddev_t *mddev);
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/* error_handler must set ->faulty and clear ->in_sync
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* if appropriate, and should abort recovery if needed
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*/
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void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev);
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int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev);
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int (*hot_remove_disk) (mddev_t *mddev, int number);
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int (*spare_active) (mddev_t *mddev);
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sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster);
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int (*resize) (mddev_t *mddev, sector_t sectors);
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int (*check_reshape) (mddev_t *mddev);
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int (*start_reshape) (mddev_t *mddev);
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int (*reconfig) (mddev_t *mddev, int layout, int chunk_size);
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/* quiesce moves between quiescence states
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* 0 - fully active
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* 1 - no new requests allowed
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* others - reserved
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*/
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void (*quiesce) (mddev_t *mddev, int state);
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};
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struct md_sysfs_entry {
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struct attribute attr;
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ssize_t (*show)(mddev_t *, char *);
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ssize_t (*store)(mddev_t *, const char *, size_t);
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};
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static inline char * mdname (mddev_t * mddev)
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{
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return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
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}
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/*
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* iterates through some rdev ringlist. It's safe to remove the
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* current 'rdev'. Dont touch 'tmp' though.
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*/
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#define ITERATE_RDEV_GENERIC(head,rdev,tmp) \
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\
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for ((tmp) = (head).next; \
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(rdev) = (list_entry((tmp), mdk_rdev_t, same_set)), \
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(tmp) = (tmp)->next, (tmp)->prev != &(head) \
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; )
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/*
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* iterates through the 'same array disks' ringlist
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*/
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#define ITERATE_RDEV(mddev,rdev,tmp) \
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ITERATE_RDEV_GENERIC((mddev)->disks,rdev,tmp)
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/*
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* Iterates through 'pending RAID disks'
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*/
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#define ITERATE_RDEV_PENDING(rdev,tmp) \
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ITERATE_RDEV_GENERIC(pending_raid_disks,rdev,tmp)
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typedef struct mdk_thread_s {
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void (*run) (mddev_t *mddev);
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mddev_t *mddev;
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wait_queue_head_t wqueue;
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unsigned long flags;
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struct task_struct *tsk;
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unsigned long timeout;
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} mdk_thread_t;
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#define THREAD_WAKEUP 0
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#define __wait_event_lock_irq(wq, condition, lock, cmd) \
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do { \
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wait_queue_t __wait; \
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init_waitqueue_entry(&__wait, current); \
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\
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add_wait_queue(&wq, &__wait); \
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for (;;) { \
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set_current_state(TASK_UNINTERRUPTIBLE); \
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if (condition) \
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break; \
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spin_unlock_irq(&lock); \
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cmd; \
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schedule(); \
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spin_lock_irq(&lock); \
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} \
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current->state = TASK_RUNNING; \
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remove_wait_queue(&wq, &__wait); \
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} while (0)
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#define wait_event_lock_irq(wq, condition, lock, cmd) \
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do { \
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if (condition) \
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break; \
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__wait_event_lock_irq(wq, condition, lock, cmd); \
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} while (0)
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static inline void safe_put_page(struct page *p)
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{
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if (p) put_page(p);
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}
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#endif /* CONFIG_BLOCK */
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#endif
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